37 lines
949 B
C
37 lines
949 B
C
#include <avr/io.h>
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#include <util/delay.h>
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#include <stdbool.h>
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#define LED_PORT PORTB0
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#define BTN_PORT PIND2
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int main(void) {
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// set pin to output
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// DDRB is the register that set the direction of the pins (IN/OUT)
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// we want to say that the LED_PORT pin is an OUT pin, which isnt the default
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DDRB |= (_BV(LED_PORT));
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// lets keep track of the led state here
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bool led_state = false;
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// lets also keep track of the button state for the last iteration
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bool prev = (PIND & _BV(BTN_PORT));
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while (true) {
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// we read it
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bool cur = (PIND & _BV(BTN_PORT));
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// if it wasnt pressed before, but pressed now -> it just turned on
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if (prev && !cur) {
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// toggle the state and update the led with the new state
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led_state = !led_state;
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if (led_state)
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PORTB |= (_BV(LED_PORT));
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else
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PORTB &= ~(_BV(LED_PORT));
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}
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// keep track of the old state for next iteration
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prev = cur;
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// sleep
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_delay_ms(20.f);
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}
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}
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